#include <algorithm>
#include <cstdint>
#include <iostream>
#include <vector>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fstream>
#include <fcntl.h>

#include "acl/acl.h"
#include "aclnn_nms_with_mask_custom.h"

#define SUCCESS 0
#define FAILED 1

#define INFO_LOG(fmt, args...) fprintf(stdout, "[INFO]  " fmt "\n", ##args)
#define WARN_LOG(fmt, args...) fprintf(stdout, "[WARN]  " fmt "\n", ##args)
#define ERROR_LOG(fmt, args...) fprintf(stderr, "[ERROR]  " fmt "\n", ##args)

#define CHECK_RET(cond, return_expr) \
    do {                             \
        if (!(cond)) {               \
            return_expr;             \
        }                            \
    } while (0)

#define LOG_PRINT(message, ...)         \
    do {                                \
        printf(message, ##__VA_ARGS__); \
    } while (0)

bool ReadFile(const std::string &filePath, size_t fileSize, void *buffer, size_t bufferSize)
{
    struct stat sBuf;
    int fileStatus = stat(filePath.data(), &sBuf);
    if (fileStatus == -1) {
        ERROR_LOG("failed to get file %s", filePath.c_str());
        return false;
    }
    if (S_ISREG(sBuf.st_mode) == 0) {
        ERROR_LOG("%s is not a file, please enter a file", filePath.c_str());
        return false;
    }

    std::ifstream file;
    file.open(filePath, std::ios::binary);
    if (!file.is_open()) {
        ERROR_LOG("Open file failed. path = %s", filePath.c_str());
        return false;
    }

    std::filebuf *buf = file.rdbuf();
    size_t size = buf->pubseekoff(0, std::ios::end, std::ios::in);
    if (size == 0) {
        ERROR_LOG("file size is 0");
        file.close();
        return false;
    }
    if (size > bufferSize) {
        ERROR_LOG("file size is larger than buffer size");
        file.close();
        return false;
    }
    buf->pubseekpos(0, std::ios::in);
    buf->sgetn(static_cast<char *>(buffer), size);
    fileSize = size;
    file.close();
    return true;
}

bool WriteFile(const std::string &filePath, const void *buffer, size_t size)
{
    if (buffer == nullptr) {
        ERROR_LOG("Write file failed. buffer is nullptr");
        return false;
    }

    int fd = open(filePath.c_str(), O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWRITE);
    if (fd < 0) {
        ERROR_LOG("Open file failed. path = %s", filePath.c_str());
        return false;
    }

    auto writeSize = write(fd, buffer, size);
    (void) close(fd);
    if (writeSize != size) {
        ERROR_LOG("Write file Failed.");
        return false;
    }

    return true;
}

int64_t GetShapeSize(const std::vector<int64_t> &shape)
{
    int64_t shapeSize = 1;
    for (auto i : shape) {
        shapeSize *= i;
    }
    return shapeSize;
}

int Init(int32_t deviceId, aclrtStream *stream)
{
    // 固定写法，acl初始化
    auto ret = aclInit(nullptr);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclInit failed. ERROR: %d\n", ret); return FAILED);
    ret = aclrtSetDevice(deviceId);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSetDevice failed. ERROR: %d\n", ret); return FAILED);
    ret = aclrtCreateStream(stream);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtCreateStream failed. ERROR: %d\n", ret); return FAILED);

    return SUCCESS;
}

template <typename T>
int CreateAclTensor(const std::vector<T> &hostData, const std::vector<int64_t> &shape, void **deviceAddr,
                    aclDataType dataType, aclTensor **tensor)
{
    auto size = GetShapeSize(shape) * sizeof(T);
    // 调用aclrtMalloc申请device侧内存
    auto ret = aclrtMalloc(deviceAddr, size, ACL_MEM_MALLOC_HUGE_FIRST);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMalloc failed. ERROR: %d\n", ret); return FAILED);

    // 调用aclrtMemcpy将host侧数据拷贝到device侧内存上
    ret = aclrtMemcpy(*deviceAddr, size, hostData.data(), size, ACL_MEMCPY_HOST_TO_DEVICE);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtMemcpy failed. ERROR: %d\n", ret); return FAILED);

    // 调用aclCreateTensor接口创建aclTensor
    *tensor = aclCreateTensor(shape.data(), shape.size(), dataType, nullptr, 0, aclFormat::ACL_FORMAT_ND, shape.data(),
                              shape.size(), *deviceAddr);
    return SUCCESS;
}

int main(int argc, char **argv)
{
    // 1. （固定写法）device/stream初始化, 参考acl对外接口列表
    // 根据自己的实际device填写deviceId
    int32_t deviceId = 0;
    aclrtStream stream;
    auto ret = Init(deviceId, &stream);
    CHECK_RET(ret == 0, LOG_PRINT("Init acl failed. ERROR: %d\n", ret); return FAILED);

    // 2. 构造输入与输出，需要根据API的接口自定义构造
    std::vector<int64_t> inputXShape = {20, 4};
    std::vector<int64_t> inputYShape = {20};
    std::vector<int64_t> outputZShape = {20};

    // 计算数据长度
    size_t inputXShapeSize = GetShapeSize(inputXShape);  // 20*4=80
    size_t inputYShapeSize = GetShapeSize(inputYShape);  // 20
    size_t outputZShapeSize = GetShapeSize(outputZShape);  // 20

    
    // 3. 从文件读取输入数据
    std::vector<float> inputXHostData(inputXShapeSize);  // boxes数据
    std::vector<float> inputYHostData(inputYShapeSize);  // scores数据
    std::vector<uint8_t> outputZHostData(outputZShapeSize, 0);

    // 读取input_x.bin (boxes)
    bool readX = ReadFile("../input/input_x.bin", inputXShapeSize * sizeof(float), 
                         inputXHostData.data(), inputXShapeSize * sizeof(float));
                         
    CHECK_RET(readX, LOG_PRINT("读取input_x.bin失败\n"); return FAILED);
    
    // 读取input_y.bin (scores)
    bool readY = ReadFile("../input/input_y.bin", inputYShapeSize * sizeof(float), 
                         inputYHostData.data(), inputYShapeSize * sizeof(float));
    CHECK_RET(readY, LOG_PRINT("读取input_y.bin失败\n"); return FAILED);

    // 验证输入数据长度
    CHECK_RET(inputXHostData.size() == inputXShapeSize, FAILED);
    CHECK_RET(inputYHostData.size() == inputYShapeSize, FAILED);
    std::cout << "输入数据长度验证通过：inputX=" << inputXHostData.size() 
              << ", inputY=" << inputYHostData.size() << std::endl;


    // 4. 创建ACL Tensor
    void* inputXDeviceAddr = nullptr;
    void* inputYDeviceAddr = nullptr;
    void* outputZDeviceAddr = nullptr;
    aclTensor* inputX = nullptr;
    aclTensor* inputY = nullptr;
    aclTensor* outputZ = nullptr;         

    ret = CreateAclTensor(inputXHostData, inputXShape, &inputXDeviceAddr, aclDataType::ACL_FLOAT, &inputX);
    CHECK_RET(ret == ACL_SUCCESS, return FAILED);
    ret = CreateAclTensor(inputYHostData, inputYShape, &inputYDeviceAddr, aclDataType::ACL_FLOAT, &inputY);
    CHECK_RET(ret == ACL_SUCCESS, return FAILED);
    ret = CreateAclTensor(outputZHostData, outputZShape, &outputZDeviceAddr, aclDataType::ACL_UINT8, &outputZ);
    CHECK_RET(ret == ACL_SUCCESS, return FAILED);

    // 3. 调用CANN自定义算子库API
    uint64_t workspaceSize = 0;
    aclOpExecutor *executor;

    double iou_threshold = 0.1f;      // NMS IoU阈值
    double scores_threshold = 0.1f;   // NMS分数阈
    // 计算workspace大小并申请内存

    ret = aclnnNMSWithMaskCustomGetWorkspaceSize(inputX, inputY, iou_threshold, scores_threshold, outputZ, &workspaceSize, &executor);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclnnNMSWithMaskCustomGetWorkspaceSize failed. ERROR: %d\n", ret); return FAILED);
    void *workspaceAddr = nullptr;
    if (workspaceSize > 0) {
        ret = aclrtMalloc(&workspaceAddr, workspaceSize, ACL_MEM_MALLOC_HUGE_FIRST);
        CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("allocate workspace failed. ERROR: %d\n", ret); return FAILED;);
    }
    // 执行算子
    ret = aclnnNMSWithMaskCustom(workspaceAddr, workspaceSize, executor, stream);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclnnNMSWithMaskCustom failed. ERROR: %d\n", ret); return FAILED);

    // （固定写法）同步等待任务执行结束
    ret = aclrtSynchronizeStream(stream);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("aclrtSynchronizeStream failed. ERROR: %d\n", ret); return FAILED);


    // 5. 获取输出的值，将device侧内存上的结果拷贝至host侧，需要根据具体API的接口定义修改
    std::vector<uint8_t> resultData(outputZShapeSize, 0);
    ret = aclrtMemcpy(resultData.data(), resultData.size() * sizeof(uint8_t), 
                     outputZDeviceAddr, outputZShapeSize * sizeof(uint8_t), 
                     ACL_MEMCPY_DEVICE_TO_HOST);
    CHECK_RET(ret == ACL_SUCCESS, LOG_PRINT("设备到主机数据拷贝失败: %d\n", ret); return FAILED);

       // 写入输出结果文件
    bool writeOk = WriteFile("../output/output_z.bin", resultData.data(), resultData.size() * sizeof(uint8_t));
    CHECK_RET(writeOk, LOG_PRINT("写入output_z.bin失败\n"); return FAILED);

    // 打印输出结果
    std::cout << "NMS输出结果（0=舍弃，1=保留）：" << std::endl;
    for (size_t i = 0; i < resultData.size(); i++) {
        std::cout << static_cast<int>(resultData[i]) << " ";
    }
    std::cout << std::endl;

    // 6. 释放aclTensor，需要根据具体API的接口定义修改
    aclDestroyTensor(inputX);
    aclDestroyTensor(inputY);
    aclDestroyTensor(outputZ);

    // 7. 释放device资源，需要根据具体API的接口定义修改
    aclrtFree(inputXDeviceAddr);
    aclrtFree(inputYDeviceAddr);
    aclrtFree(outputZDeviceAddr);
    if (workspaceSize > 0) {
        aclrtFree(workspaceAddr);
    }
    aclrtDestroyStream(stream);
    aclrtResetDevice(deviceId);
    aclFinalize();
    return SUCCESS;
}
